Re: net: phy: marvell: network working with generic PHY and not with marvell PHY

From: Andrew Lunn <andrew@lunn.ch>
To: "Russell King (Oracle)" <linux@armlinux.org.uk>
Cc: Corentin Labbe <clabbe.montjoie@gmail.com>,
	linus.walleij@linaro.org, ulli.kroll@googlemail.com,
	kuba@kernel.org, davem@davemloft.net, hkallweit1@gmail.com,
	linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: net: phy: marvell: network working with generic PHY and not with marvell PHY
Date: Tue, 4 Jan 2022 15:46:19 +0100	[thread overview]
Message-ID: <YdRdu3jFPnGd1DsH@lunn.ch> (raw)
In-Reply-To: <YdRZQl6U0y19P/0+@shell.armlinux.org.uk>

> @@ -1227,16 +1227,18 @@ static int m88e1118_config_init(struct phy_device *phydev)
>  {
>  	int err;
>  
> -	/* Change address */
> -	err = marvell_set_page(phydev, MII_MARVELL_MSCR_PAGE);
> -	if (err < 0)
> -		return err;
> -
>  	/* Enable 1000 Mbit */
> -	err = phy_write(phydev, 0x15, 0x1070);
> +	err = phy_write_paged(phydev, MII_MARVELL_MSCR_PAGE,
> +			      MII_88E1121_PHY_MSCR_REG, 0x1070);

Ah, yes, keeping this makes it more backwards compatible.

It would be nice to replace the 0x1070 with #defines.

We already have:

#define MII_88E1121_PHY_MSCR_RX_DELAY	BIT(5)
#define MII_88E1121_PHY_MSCR_TX_DELAY	BIT(4)
#define MII_88E1121_PHY_MSCR_DELAY_MASK	(BIT(5) | BIT(4))

Bits 6 is the MSB of the default MAC speed.
Bit 13 is the LSB of the default MAC speed. These two should default to 10b = 1000Mbps
Bit 12 is reserved, and should be written 1.

    Andrew